Insecticidal potential of Cestrum sp. (Solanaceae: Solanales) against Tribolium castaneum and Tribolium confusum (Herbst) (Coleoptera- Tenebrionidae)

Ethanol extract of plants Cestrum nocturnum and Cestrum diurnum were studied for their effect on the stored grain pest Tribolium confusum and Tribolium castaneum (Herbst). Effect of the plants extract on duration of last instars larval period, % of
emergence, weight and mortality of T. castaneum and T. confusum was evaluated and statistical analysed and graphically presented. Insecticidal effect varies with cestrum species. Comparatively alcoholic extract showed remarkable insecticidal activity than the aqueous extract against Tribolium sp. Extract incorporated diet when fed to larvae the growth was significantly inhibited. Devlopment of insect was abstracted due to the extracts of Cestrum sp. These plant extracts could be useful for controlling the store grain pest T. castaneum and T. confusum.